Air gun stock



FIG. 1 is a perspective view of an air gun stock showing my new design;

FIG. 2 is a right side plan view thereof;

FIG. 3 is a left side plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view; and,

FIG. 7 is a rear elevational view.

The portions of the article shown in broken/dashed lines form no part of the claimed design. 

The ornamental design for air gun stock, as shown and described. 